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Btrfs: fix key checks and advance in the search ioctl 

The search ioctl was working well for finding tree roots, but using it for
generic searches requires a few changes to how the keys are advanced.
This treats the search control min fields for objectid, type and offset
more like a key, where we drop the offset to zero once we bump the type,
etc.

The downside of this is that we are changing the min_type and min_offset
fields during the search, and so the ioctl caller needs extra checks to make sure
the keys in the result are the ones it wanted.

This also changes key_in_sk to use btrfs_comp_cpu_keys, just to make
things more readable.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2010-03-18 12:10:08 -04:00
parent 7fde62bffb
commit abc6e1341b
1 changed files with 27 additions and 16 deletions
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43
fs/btrfs/ioctl.c
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@ -914,17 +914,23 @@ out:
static noinline int key_in_sk(struct btrfs_key *key,
struct btrfs_ioctl_search_key *sk)
{
if (key->objectid < sk->min_objectid)
struct btrfs_key test;
int ret;
test.objectid = sk->min_objectid;
test.type = sk->min_type;
test.offset = sk->min_offset;
ret = btrfs_comp_cpu_keys(key, &test);
if (ret < 0)
return 0;
if (key->offset < sk->min_offset)
return 0;
if (key->type < sk->min_type)
return 0;
if (key->objectid > sk->max_objectid)
return 0;
if (key->type > sk->max_type)
return 0;
if (key->offset > sk->max_offset)
test.objectid = sk->max_objectid;
test.type = sk->max_type;
test.offset = sk->max_offset;
ret = btrfs_comp_cpu_keys(key, &test);
if (ret > 0)
return 0;
return 1;
}
@ -998,13 +1004,18 @@ static noinline int copy_to_sk(struct btrfs_root *root,
break;
}
advance_key:
if (key->offset < (u64)-1)
key->offset++;
else if (key->type < (u8)-1)
key->type++;
else if (key->objectid < (u64)-1)
key->objectid++;
ret = 0;
if (key->offset < (u64)-1 && key->offset < sk->max_offset)
key->offset++;
else if (key->type < (u8)-1 && key->type < sk->max_type) {
key->offset = 0;
key->type++;
} else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
key->offset = 0;
key->type = 0;
key->objectid++;
} else
ret = 1;
overflow:
*num_found += found;
return ret;